방법 1: SET PASSWORD 명령 사용
mysql -u root mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('newpass');
mysqladmin -u root password "newpass"
mysqladmin -u root password oldpass "newpass"
mysql -u root mysql> use mysql; mysql> UPDATE user SET Password = PASSWORD('newpass') WHERE user = 'root'; mysql> FLUSH PRIVILEGES;